Share-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
May. 31, 2015	May. 31, 2014
Share-based compensation plans
Number of shares withheld for the federal tax obligations	0
SHARE-BASED PAYMENT EXPENSE
Less income tax benefits	$ (319)	$ (127)
Share-based payment expense, net of income tax benefits	$ 1,794	$ 1,243
Earnings per share impact of share-based payment expense:
Basic (in dollars per share)	$ 0.06	$ 0.04
Diluted (in dollars per share)	$ 0.06	$ 0.04
SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 2,113	$ 1,369
Employee stock options
Share-based compensation plans
Options granted (in shares)	145,500
Range of risk free interest rates used, minimum (as a percent)	1.28%
Range of risk free interest rates used, maximum (as a percent)	1.37%
Expected dividend rate (as a percent)	0.00%
Range of expected volatility rates used, minimum (as a percent)	37.26%
Range of expected volatility rates used, maximum (as a percent)	39.48%
Exercise of stock options (in shares)	106,825
Employee stock options \| Minimum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 24.34
Term of award	4 years
Expected terms used	4 years 18 days
Employee stock options \| Maximum
Share-based compensation plans
Fair value for grants (in dollars per share)	$ 29.68
Term of award	5 years
Expected terms used	4 years 4 months 6 days
Restricted stock (RSA) \| Directors
Share-based compensation plans
Granted, issued or earned, Awards issued or earned (in shares)	1,575
Grant date fair value	$ 120
Grant date fair value (in dollars per share)	$ 78.11
Stock compensation \| Directors \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 175	247
Stock compensation \| CEO
Share-based compensation plans
Granted, issued or earned, Awards issued or earned (in shares)	2,000
Vested and settled or exercised, fair value (in dollars per share)	$ 89.12
Performance-based and other stock awards \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 1,245	418
Stock Option Officers Employees and Consultants [Member] \| SG&A
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	$ 693	$ 704

No definition available.

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Represents the effect of share-based compensation expenses on the basic earnings per share during the reporting period.

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Represents the effect of share-based compensation expenses on the diluted earnings per share during the reporting period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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No definition available.

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Number of share options (or share units) exercised during the current period.

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